CVE-2023-48369 — server
MEDIUMCVE-2023-48369 is a medium-severity (CVSS 4.3) Uncontrolled Resource Consumption vulnerability in github.com/mattermost/mattermost/server/v8. A fix is available for github.com/mattermost/mattermost/server/v8 — see the affected versions and patch details below.
Log Flooding due to specially crafted requests in different endpoints
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost/server/v8🐹github.com/mattermost/mattermost-server/v6Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.
Description
Mattermost fails to limit the log size of server logs allowing an attacker sending specially crafted requests to different endpoints to potentially overflow the log.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐹Go | github.com/mattermost/mattermost/server/v8 | ≥ 9.1.0&&< 9.1.1 | 9.1.1go get github.com/mattermost/mattermost/server/v8@v9.1.1 |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | ≥ 9.0.0&&< 9.0.2 | 9.0.2go get github.com/mattermost/mattermost/server/v8@v9.0.2 |
| 🐹Go | github.com/mattermost/mattermost/server/v8 | all versions | 8.1.4go get github.com/mattermost/mattermost/server/v8@v8.1.4 |
| 🐹Go | github.com/mattermost/mattermost-server/v6 | all versions | 7.8.13go get github.com/mattermost/mattermost-server/v6@v7.8.13 |
Affected Products
mattermostmattermostDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/mattermost/mattermost/server/v8, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/mattermost/mattermost/server/v8 to 9.1.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2023-48369 is resolved across your whole dependency graph.
Workarounds
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.
Frequently Asked Questions
Is CVE-2023-48369 in your dependencies?
Find it across Go, including transitive dependencies.